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   <div id="projectbrief">A system-level modeling framework for designing real-time embedded systems</div>
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<div class="header">
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<div class="title">UnreachableInstructionEliminator.cs</div>  </div>
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<div class="contents">
<a href="_unreachable_instruction_eliminator_8cs.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;</div>
<div class="line"><a name="l00020"></a><span class="lineno">   20</span>&#160;<span class="keyword">using</span> System;</div>
<div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160;<span class="keyword">using</span> System.Collections.Generic;</div>
<div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;<span class="keyword">using</span> System.Linq;</div>
<div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;<span class="keyword">using</span> System.Text;</div>
<div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160;<span class="keyword">using</span> SystemSharp.Analysis.M2M;</div>
<div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160;<span class="keyword">using</span> SystemSharp.Assembler;</div>
<div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;<span class="keyword">using</span> SystemSharp.Assembler.Rewriters;</div>
<div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160;</div>
<div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;<span class="keyword">namespace </span>SystemSharp.Assembler.Rewriters</div>
<div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;{</div>
<div class="line"><a name="l00030"></a><span class="lineno"><a class="line" href="class_system_sharp_1_1_assembler_1_1_rewriters_1_1_unreachable_instruction_eliminator_impl.html">   30</a></span>&#160;    <span class="keyword">class </span><a class="code" href="class_system_sharp_1_1_assembler_1_1_rewriters_1_1_unreachable_instruction_eliminator_impl.html">UnreachableInstructionEliminatorImpl</a> : <a class="code" href="class_system_sharp_1_1_assembler_1_1_rewriters_1_1_x_i_l_s_rewriter.html">XILSRewriter</a></div>
<div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;    {</div>
<div class="line"><a name="l00032"></a><span class="lineno"><a class="line" href="class_system_sharp_1_1_assembler_1_1_rewriters_1_1_unreachable_instruction_eliminator_impl.html#ad696cd0fbc09217f8292bed6309aca8b">   32</a></span>&#160;        <span class="keyword">public</span> <a class="code" href="class_system_sharp_1_1_assembler_1_1_rewriters_1_1_unreachable_instruction_eliminator_impl.html#ad696cd0fbc09217f8292bed6309aca8b">UnreachableInstructionEliminatorImpl</a>(IList&lt;XILSInstr&gt; instrs) :</div>
<div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;            base(instrs)</div>
<div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;        {</div>
<div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;        }</div>
<div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;</div>
<div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;        <span class="keyword">private</span> <span class="keywordtype">bool</span>[] _reach;</div>
<div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;</div>
<div class="line"><a name="l00039"></a><span class="lineno"><a class="line" href="class_system_sharp_1_1_assembler_1_1_rewriters_1_1_unreachable_instruction_eliminator_impl.html#ac12380385488fb6e94e1f80330b9a92d">   39</a></span>&#160;        <span class="keyword">protected</span> <span class="keyword">override</span> <span class="keywordtype">void</span> <a class="code" href="class_system_sharp_1_1_assembler_1_1_rewriters_1_1_unreachable_instruction_eliminator_impl.html#ac12380385488fb6e94e1f80330b9a92d">PreProcess</a>()</div>
<div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;        {</div>
<div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;            base.PreProcess();</div>
<div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;            var q = <span class="keyword">new</span> Queue&lt;XILSInstr&gt;();</div>
<div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;            _reach = <span class="keyword">new</span> <span class="keywordtype">bool</span>[InInstructions.Count];</div>
<div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;            q.Enqueue(InInstructions.First());</div>
<div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;            <span class="keywordflow">while</span> (q.Count &gt; 0)</div>
<div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;            {</div>
<div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;                var xilsi = q.Dequeue();</div>
<div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;                <span class="keywordflow">if</span> (!_reach[xilsi.Index])</div>
<div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;                {</div>
<div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;                    _reach[xilsi.Index] = <span class="keyword">true</span>;</div>
<div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;                    <span class="keywordflow">switch</span> (xilsi.Name)</div>
<div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;                    {</div>
<div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160;                        <span class="keywordflow">case</span> InstructionCodes.Goto:</div>
<div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;                        <span class="keywordflow">case</span> InstructionCodes.BranchIfTrue:</div>
<div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;                        <span class="keywordflow">case</span> InstructionCodes.BranchIfFalse:</div>
<div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160;                            {</div>
<div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;                                var target = (<a class="code" href="class_system_sharp_1_1_assembler_1_1_branch_label.html">BranchLabel</a>)xilsi.StaticOperand;</div>
<div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;                                q.Enqueue(InInstructions[target.InstructionIndex]);</div>
<div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;                                <span class="keywordflow">if</span> (xilsi.Name != <a class="code" href="class_system_sharp_1_1_assembler_1_1_instruction_codes.html">InstructionCodes</a>.<a class="code" href="class_system_sharp_1_1_assembler_1_1_instruction_codes.html#aa5ff90a79e93b805f3f0935a366dd2cc">Goto</a>)</div>
<div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160;                                    <span class="keywordflow">goto</span> <span class="keywordflow">default</span>;</div>
<div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;                            }</div>
<div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;                            <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160;</div>
<div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;                        <span class="keywordflow">default</span>:</div>
<div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;                            <span class="keywordflow">if</span> (xilsi.Index + 1 &lt; InInstructions.Count)</div>
<div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;                                q.Enqueue(InInstructions[xilsi.Index + 1]);</div>
<div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;                            <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;                    }</div>
<div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;                }</div>
<div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;            }</div>
<div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;            <span class="keywordflow">foreach</span> (var xilsi <span class="keywordflow">in</span> InInstructions)</div>
<div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;            {</div>
<div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160;                <span class="keywordflow">if</span> (xilsi.Name == <a class="code" href="class_system_sharp_1_1_assembler_1_1_instruction_codes.html">InstructionCodes</a>.<a class="code" href="class_system_sharp_1_1_assembler_1_1_instruction_codes.html#a136d7ae431118df2a41802db861576cb">Nop</a>)</div>
<div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160;                    _reach[xilsi.Index] = <span class="keyword">false</span>;</div>
<div class="line"><a name="l00075"></a><span class="lineno">   75</span>&#160;            }</div>
<div class="line"><a name="l00076"></a><span class="lineno">   76</span>&#160;        }</div>
<div class="line"><a name="l00077"></a><span class="lineno">   77</span>&#160;</div>
<div class="line"><a name="l00078"></a><span class="lineno"><a class="line" href="class_system_sharp_1_1_assembler_1_1_rewriters_1_1_unreachable_instruction_eliminator_impl.html#a87a5e48c25512a15a52f5efd8a822411">   78</a></span>&#160;        <span class="keyword">protected</span> <span class="keyword">override</span> <span class="keywordtype">void</span> <a class="code" href="class_system_sharp_1_1_assembler_1_1_rewriters_1_1_unreachable_instruction_eliminator_impl.html#a87a5e48c25512a15a52f5efd8a822411">ProcessInstruction</a>(<a class="code" href="class_system_sharp_1_1_assembler_1_1_x_i_l_s_instr.html">XILSInstr</a> i)</div>
<div class="line"><a name="l00079"></a><span class="lineno">   79</span>&#160;        {</div>
<div class="line"><a name="l00080"></a><span class="lineno">   80</span>&#160;            <span class="keywordflow">if</span> (_reach[i.<a class="code" href="class_system_sharp_1_1_assembler_1_1_x_i_l_s_instr.html#a3ee2e647d981c0a826cb938f1b398b4f">Index</a>])</div>
<div class="line"><a name="l00081"></a><span class="lineno">   81</span>&#160;                base.ProcessInstruction(i);</div>
<div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;        }</div>
<div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160;    }</div>
<div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;</div>
<div class="line"><a name="l00088"></a><span class="lineno"><a class="line" href="class_system_sharp_1_1_assembler_1_1_rewriters_1_1_unreachable_instruction_eliminator.html">   88</a></span>&#160;    <span class="keyword">public</span> <span class="keyword">class </span><a class="code" href="class_system_sharp_1_1_assembler_1_1_rewriters_1_1_unreachable_instruction_eliminator.html">UnreachableInstructionEliminator</a>: <a class="code" href="interface_system_sharp_1_1_analysis_1_1_m2_m_1_1_i_x_i_l_s_rewriter.html">IXILSRewriter</a></div>
<div class="line"><a name="l00089"></a><span class="lineno">   89</span>&#160;    {</div>
<div class="line"><a name="l00090"></a><span class="lineno"><a class="line" href="class_system_sharp_1_1_assembler_1_1_rewriters_1_1_unreachable_instruction_eliminator.html#a8f3e90a97982abd32a6496a7b184a9c5">   90</a></span>&#160;        <span class="keyword">public</span> IList&lt;XILSInstr&gt; <a class="code" href="class_system_sharp_1_1_assembler_1_1_rewriters_1_1_unreachable_instruction_eliminator.html#a8f3e90a97982abd32a6496a7b184a9c5">Rewrite</a>(IList&lt;XILSInstr&gt; instrs)</div>
<div class="line"><a name="l00091"></a><span class="lineno">   91</span>&#160;        {</div>
<div class="line"><a name="l00092"></a><span class="lineno">   92</span>&#160;            var impl = <span class="keyword">new</span> <a class="code" href="class_system_sharp_1_1_assembler_1_1_rewriters_1_1_unreachable_instruction_eliminator_impl.html">UnreachableInstructionEliminatorImpl</a>(instrs);</div>
<div class="line"><a name="l00093"></a><span class="lineno">   93</span>&#160;            impl.Rewrite();</div>
<div class="line"><a name="l00094"></a><span class="lineno">   94</span>&#160;            <span class="keywordflow">return</span> impl.OutInstructions;</div>
<div class="line"><a name="l00095"></a><span class="lineno">   95</span>&#160;        }</div>
<div class="line"><a name="l00096"></a><span class="lineno">   96</span>&#160;</div>
<div class="line"><a name="l00097"></a><span class="lineno"><a class="line" href="class_system_sharp_1_1_assembler_1_1_rewriters_1_1_unreachable_instruction_eliminator.html#a4f44357b2e0a889b8fca637620358987">   97</a></span>&#160;        <span class="keyword">public</span> <span class="keyword">override</span> <span class="keywordtype">string</span> <a class="code" href="class_system_sharp_1_1_assembler_1_1_rewriters_1_1_unreachable_instruction_eliminator.html#a4f44357b2e0a889b8fca637620358987">ToString</a>()</div>
<div class="line"><a name="l00098"></a><span class="lineno">   98</span>&#160;        {</div>
<div class="line"><a name="l00099"></a><span class="lineno">   99</span>&#160;            <span class="keywordflow">return</span> <span class="stringliteral">&quot;eliminate unreachable instructions&quot;</span>;</div>
<div class="line"><a name="l00100"></a><span class="lineno">  100</span>&#160;        }</div>
<div class="line"><a name="l00101"></a><span class="lineno">  101</span>&#160;    }</div>
<div class="line"><a name="l00102"></a><span class="lineno">  102</span>&#160;}</div>
<div class="ttc" id="class_system_sharp_1_1_assembler_1_1_x_i_l_s_instr_html_a3ee2e647d981c0a826cb938f1b398b4f"><div class="ttname"><a href="class_system_sharp_1_1_assembler_1_1_x_i_l_s_instr.html#a3ee2e647d981c0a826cb938f1b398b4f">SystemSharp.Assembler.XILSInstr.Index</a></div><div class="ttdeci">int Index</div><div class="ttdoc">Instruction index </div><div class="ttdef"><b>Definition:</b> <a href="_asm_core_8cs_source.html#l00454">AsmCore.cs:454</a></div></div>
<div class="ttc" id="class_system_sharp_1_1_assembler_1_1_rewriters_1_1_unreachable_instruction_eliminator_html"><div class="ttname"><a href="class_system_sharp_1_1_assembler_1_1_rewriters_1_1_unreachable_instruction_eliminator.html">SystemSharp.Assembler.Rewriters.UnreachableInstructionEliminator</a></div><div class="ttdoc">This XIL-S code transformation eliminates unreachable instructions </div><div class="ttdef"><b>Definition:</b> <a href="_unreachable_instruction_eliminator_8cs_source.html#l00088">UnreachableInstructionEliminator.cs:88</a></div></div>
<div class="ttc" id="class_system_sharp_1_1_assembler_1_1_instruction_codes_html_a136d7ae431118df2a41802db861576cb"><div class="ttname"><a href="class_system_sharp_1_1_assembler_1_1_instruction_codes.html#a136d7ae431118df2a41802db861576cb">SystemSharp.Assembler.InstructionCodes.Nop</a></div><div class="ttdeci">const string Nop</div><div class="ttdoc">Empty instruction </div><div class="ttdef"><b>Definition:</b> <a href="_instruction_set_8cs_source.html#l00261">InstructionSet.cs:261</a></div></div>
<div class="ttc" id="class_system_sharp_1_1_assembler_1_1_rewriters_1_1_unreachable_instruction_eliminator_impl_html_ad696cd0fbc09217f8292bed6309aca8b"><div class="ttname"><a href="class_system_sharp_1_1_assembler_1_1_rewriters_1_1_unreachable_instruction_eliminator_impl.html#ad696cd0fbc09217f8292bed6309aca8b">SystemSharp.Assembler.Rewriters.UnreachableInstructionEliminatorImpl.UnreachableInstructionEliminatorImpl</a></div><div class="ttdeci">UnreachableInstructionEliminatorImpl(IList&lt; XILSInstr &gt; instrs)</div><div class="ttdef"><b>Definition:</b> <a href="_unreachable_instruction_eliminator_8cs_source.html#l00032">UnreachableInstructionEliminator.cs:32</a></div></div>
<div class="ttc" id="class_system_sharp_1_1_assembler_1_1_rewriters_1_1_unreachable_instruction_eliminator_html_a4f44357b2e0a889b8fca637620358987"><div class="ttname"><a href="class_system_sharp_1_1_assembler_1_1_rewriters_1_1_unreachable_instruction_eliminator.html#a4f44357b2e0a889b8fca637620358987">SystemSharp.Assembler.Rewriters.UnreachableInstructionEliminator.ToString</a></div><div class="ttdeci">override string ToString()</div><div class="ttdef"><b>Definition:</b> <a href="_unreachable_instruction_eliminator_8cs_source.html#l00097">UnreachableInstructionEliminator.cs:97</a></div></div>
<div class="ttc" id="class_system_sharp_1_1_assembler_1_1_rewriters_1_1_unreachable_instruction_eliminator_impl_html_ac12380385488fb6e94e1f80330b9a92d"><div class="ttname"><a href="class_system_sharp_1_1_assembler_1_1_rewriters_1_1_unreachable_instruction_eliminator_impl.html#ac12380385488fb6e94e1f80330b9a92d">SystemSharp.Assembler.Rewriters.UnreachableInstructionEliminatorImpl.PreProcess</a></div><div class="ttdeci">override void PreProcess()</div><div class="ttdoc">This method is called before processing all inputs instructions. It does nothing by default...</div><div class="ttdef"><b>Definition:</b> <a href="_unreachable_instruction_eliminator_8cs_source.html#l00039">UnreachableInstructionEliminator.cs:39</a></div></div>
<div class="ttc" id="class_system_sharp_1_1_assembler_1_1_x_i_l_s_instr_html"><div class="ttname"><a href="class_system_sharp_1_1_assembler_1_1_x_i_l_s_instr.html">SystemSharp.Assembler.XILSInstr</a></div><div class="ttdoc">A XIL-S instruction </div><div class="ttdef"><b>Definition:</b> <a href="_asm_core_8cs_source.html#l00444">AsmCore.cs:444</a></div></div>
<div class="ttc" id="interface_system_sharp_1_1_analysis_1_1_m2_m_1_1_i_x_i_l_s_rewriter_html"><div class="ttname"><a href="interface_system_sharp_1_1_analysis_1_1_m2_m_1_1_i_x_i_l_s_rewriter.html">SystemSharp.Analysis.M2M.IXILSRewriter</a></div><div class="ttdoc">An interface for classes which rewrite lists of XIL-S instructions. </div><div class="ttdef"><b>Definition:</b> <a href="_h_l_s_8cs_source.html#l00047">HLS.cs:47</a></div></div>
<div class="ttc" id="class_system_sharp_1_1_assembler_1_1_rewriters_1_1_unreachable_instruction_eliminator_impl_html_a87a5e48c25512a15a52f5efd8a822411"><div class="ttname"><a href="class_system_sharp_1_1_assembler_1_1_rewriters_1_1_unreachable_instruction_eliminator_impl.html#a87a5e48c25512a15a52f5efd8a822411">SystemSharp.Assembler.Rewriters.UnreachableInstructionEliminatorImpl.ProcessInstruction</a></div><div class="ttdeci">override void ProcessInstruction(XILSInstr i)</div><div class="ttdoc">This method is called for any instruction. Its default behavior is to lookup handler inside the handl...</div><div class="ttdef"><b>Definition:</b> <a href="_unreachable_instruction_eliminator_8cs_source.html#l00078">UnreachableInstructionEliminator.cs:78</a></div></div>
<div class="ttc" id="class_system_sharp_1_1_assembler_1_1_instruction_codes_html"><div class="ttname"><a href="class_system_sharp_1_1_assembler_1_1_instruction_codes.html">SystemSharp.Assembler.InstructionCodes</a></div><div class="ttdoc">All XIL opcodes </div><div class="ttdef"><b>Definition:</b> <a href="_instruction_set_8cs_source.html#l00036">InstructionSet.cs:36</a></div></div>
<div class="ttc" id="class_system_sharp_1_1_assembler_1_1_branch_label_html"><div class="ttname"><a href="class_system_sharp_1_1_assembler_1_1_branch_label.html">SystemSharp.Assembler.BranchLabel</a></div><div class="ttdoc">A branch label </div><div class="ttdef"><b>Definition:</b> <a href="_asm_core_8cs_source.html#l00580">AsmCore.cs:580</a></div></div>
<div class="ttc" id="class_system_sharp_1_1_assembler_1_1_instruction_codes_html_aa5ff90a79e93b805f3f0935a366dd2cc"><div class="ttname"><a href="class_system_sharp_1_1_assembler_1_1_instruction_codes.html#aa5ff90a79e93b805f3f0935a366dd2cc">SystemSharp.Assembler.InstructionCodes.Goto</a></div><div class="ttdeci">const string Goto</div><div class="ttdoc">Unconditional branch </div><div class="ttdef"><b>Definition:</b> <a href="_instruction_set_8cs_source.html#l00131">InstructionSet.cs:131</a></div></div>
<div class="ttc" id="class_system_sharp_1_1_assembler_1_1_rewriters_1_1_x_i_l_s_rewriter_html"><div class="ttname"><a href="class_system_sharp_1_1_assembler_1_1_rewriters_1_1_x_i_l_s_rewriter.html">SystemSharp.Assembler.Rewriters.XILSRewriter</a></div><div class="ttdoc">This class provides a default implementation of a XIL-S code transformation. It alleviates the user f...</div><div class="ttdef"><b>Definition:</b> <a href="_x_i_l_s_rewriter_8cs_source.html#l00033">XILSRewriter.cs:33</a></div></div>
<div class="ttc" id="class_system_sharp_1_1_assembler_1_1_rewriters_1_1_unreachable_instruction_eliminator_impl_html"><div class="ttname"><a href="class_system_sharp_1_1_assembler_1_1_rewriters_1_1_unreachable_instruction_eliminator_impl.html">SystemSharp.Assembler.Rewriters.UnreachableInstructionEliminatorImpl</a></div><div class="ttdef"><b>Definition:</b> <a href="_unreachable_instruction_eliminator_8cs_source.html#l00030">UnreachableInstructionEliminator.cs:30</a></div></div>
<div class="ttc" id="class_system_sharp_1_1_assembler_1_1_rewriters_1_1_unreachable_instruction_eliminator_html_a8f3e90a97982abd32a6496a7b184a9c5"><div class="ttname"><a href="class_system_sharp_1_1_assembler_1_1_rewriters_1_1_unreachable_instruction_eliminator.html#a8f3e90a97982abd32a6496a7b184a9c5">SystemSharp.Assembler.Rewriters.UnreachableInstructionEliminator.Rewrite</a></div><div class="ttdeci">IList&lt; XILSInstr &gt; Rewrite(IList&lt; XILSInstr &gt; instrs)</div><div class="ttdoc">Rewrites a list of XIL-S instructions. </div><div class="ttdef"><b>Definition:</b> <a href="_unreachable_instruction_eliminator_8cs_source.html#l00090">UnreachableInstructionEliminator.cs:90</a></div></div>
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